| /* |
| smbus.h - SMBus level access helper functions |
| |
| Copyright (C) 1995-97 Simon G. Vogl |
| Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl> |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| MA 02110-1301 USA. |
| */ |
| |
| #ifndef LIB_I2C_SMBUS_H |
| #define LIB_I2C_SMBUS_H |
| |
| #define I2C_API_VERSION 0x100 |
| |
| #include <linux/types.h> |
| #include <linux/i2c.h> |
| |
| extern __s32 i2c_smbus_access(int file, char read_write, __u8 command, |
| int size, union i2c_smbus_data *data); |
| |
| extern __s32 i2c_smbus_write_quick(int file, __u8 value); |
| extern __s32 i2c_smbus_read_byte(int file); |
| extern __s32 i2c_smbus_write_byte(int file, __u8 value); |
| extern __s32 i2c_smbus_read_byte_data(int file, __u8 command); |
| extern __s32 i2c_smbus_write_byte_data(int file, __u8 command, __u8 value); |
| extern __s32 i2c_smbus_read_word_data(int file, __u8 command); |
| extern __s32 i2c_smbus_write_word_data(int file, __u8 command, __u16 value); |
| extern __s32 i2c_smbus_process_call(int file, __u8 command, __u16 value); |
| |
| /* Returns the number of read bytes */ |
| extern __s32 i2c_smbus_read_block_data(int file, __u8 command, __u8 *values); |
| extern __s32 i2c_smbus_write_block_data(int file, __u8 command, __u8 length, |
| const __u8 *values); |
| |
| /* Returns the number of read bytes */ |
| /* Until kernel 2.6.22, the length is hardcoded to 32 bytes. If you |
| ask for less than 32 bytes, your code will only work with kernels |
| 2.6.23 and later. */ |
| extern __s32 i2c_smbus_read_i2c_block_data(int file, __u8 command, __u8 length, |
| __u8 *values); |
| extern __s32 i2c_smbus_write_i2c_block_data(int file, __u8 command, __u8 length, |
| const __u8 *values); |
| |
| /* Returns the number of read bytes */ |
| extern __s32 i2c_smbus_block_process_call(int file, __u8 command, __u8 length, |
| __u8 *values); |
| |
| #endif /* LIB_I2C_SMBUS_H */ |